// 字符串加密成 hex 字符串
function sha1(s) {
	var data = new Uint8Array(encodeUTF8(s))
	var i, j, t;
	var l = ((data.length + 8) >>> 6 << 4) + 16, s = new Uint8Array(l << 2);
	s.set(new Uint8Array(data.buffer)), s = new Uint32Array(s.buffer);
	for (t = new DataView(s.buffer), i = 0; i < l; i++)
		s[i] = t.getUint32(i << 2);
	s[data.length >> 2] |= 0x80 << (24 - (data.length & 3) * 8);
	s[l - 1] = data.length << 3;
	var w = [], f = [ function() {
		return m[1] & m[2] | ~m[1] & m[3];
	}, function() {
		return m[1] ^ m[2] ^ m[3];
	}, function() {
		return m[1] & m[2] | m[1] & m[3] | m[2] & m[3];
	}, function() {
		return m[1] ^ m[2] ^ m[3];
	} ], rol = function(n, c) {
		return n << c | n >>> (32 - c);
	}, k = [ 1518500249, 1859775393, -1894007588, -899497514 ], m = [
			1732584193, -271733879, null, null, -1009589776 ];
	m[2] = ~m[0], m[3] = ~m[1];
	for (i = 0; i < s.length; i += 16) {
		var o = m.slice(0);
		for (j = 0; j < 80; j++)
			w[j] = j < 16 ? s[i + j] : rol(w[j - 3] ^ w[j - 8] ^ w[j - 14]
					^ w[j - 16], 1), t = rol(m[0], 5) + f[j / 20 | 0]() + m[4]
					+ w[j] + k[j / 20 | 0] | 0, m[1] = rol(m[1], 30), m.pop(),
					m.unshift(t);
		for (j = 0; j < 5; j++)
			m[j] = m[j] + o[j] | 0;
	}
	;
	t = new DataView(new Uint32Array(m).buffer);
	for (var i = 0; i < 5; i++)
		m[i] = t.getUint32(i << 2);

	var hex = Array.prototype.map.call(
			new Uint8Array(new Uint32Array(m).buffer), function(e) {
				return (e < 16 ? "0" : "") + e.toString(16);
			}).join("");

	return hex;
}

function encodeUTF8(s) {
	var i, r = [], c, x;
	for (i = 0; i < s.length; i++)
		if ((c = s.charCodeAt(i)) < 0x80)
			r.push(c);
		else if (c < 0x800)
			r.push(0xC0 + (c >> 6 & 0x1F), 0x80 + (c & 0x3F));
		else {
			if ((x = c ^ 0xD800) >> 10 == 0) // 对四字节UTF-16转换为Unicode
				c = (x << 10) + (s.charCodeAt(++i) ^ 0xDC00) + 0x10000, r.push(
						0xF0 + (c >> 18 & 0x7), 0x80 + (c >> 12 & 0x3F));
			else
				r.push(0xE0 + (c >> 12 & 0xF));
			r.push(0x80 + (c >> 6 & 0x3F), 0x80 + (c & 0x3F));
		}
	;
	return r;
}